Whazz the whole lot up in the blender and pour into pretty bottle. Store in the fridge and use within 1 month. Make sure you write this on the gifty label. Drink ice cold or over ice or pour a little over good vanilla icecream.
Cost is about £3.50 per 1 litre.
This will keep in fridge for up to 1 ½ weeks. Give it a shake before pouring.